DE2747784A1 - ELECTRIC SAFETY DISCONNECTOR - Google Patents

Description

description

The invention relates to an electrical safety disconnector or an electrical switch with a safety disconnection device to an electrical circuit as well then to be able to safely interrupt when the contacts of the switch are welded together.

There are already known switches with devices to open the switch or the switch contacts even when the contacts get stuck or are welded together. The switch known from US Pat. No. 3,035,134 is a Mechanism provided in which the movable contact with the operating lever or the trigger force effective and for as long is transferred to one that occurs between contacts To break the weld apart by shear forces. These conventional switches are quite suitable for the purposes for which they are intended. However, these switches do not allow Separation of welded contacts regardless of an additional one Exertion of force on the operating lever.

The invention is therefore based on the object of a safety disconnector to create in which the welded contacts are not due to additional or further exertion of force be separated from each other on the outside, in which the separation of the welded or hanging contacts rather without external Influence is possible.

According to the invention, this object is achieved with an electrical Safety disconnector released, which is characterized by a fixed contact, a movable contact that is related to each other of the fixed contact closes and opens and an electrical current path closes and interrupts, switch actuation devices for the moving contact to close and open it, safety disconnect connection devices in the electrical current path, which this when moving the switch operating devices to open the movable

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Eontaktes is interrupted when the moving contact with is welded to the fixed contact and does not open.

The object according to the invention is also achieved with an electrical safety disconnector, which is identified by a two-pole switch with two fixed contacts, equipped with terminals for connecting the fixed contacts to an external circuit, two movable contacts., which are provided for closing or opening the respective fixed contacts and a two-pole electrical connection close or interrupt, switch actuation devices fii: the moving contacts to close and open them, two connections to connect the moving contacts to an external circuit, safety disconnect connection devices, which are connected to the two connections in their Can be changed in position, normally keep the movable contacts in electrical connection with the connections and are biased to get free from the moving contacts when the contacts are welded, but usually with keep in touch with the moving contacts, as well as with in the release devices provided for the switch operating devices and normally held in place; move to open welded contacts, however to cause a trip and to disconnect the movable contacts from the safety disconnect connection devices so that these are released from the moving contacts and the two-pole electrical connection is interrupted.

Advantageous refinements of the invention are specified in the subclaims.

The invention is explained in more detail below with reference to the drawings, for example. Show it:

1 shows an enlarged, partial longitudinal cross-section through

a two-pole, electrical safety disconnector with a release device for industrial purposes or for use in electrical devices to

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the switch actuation mechanism and the safety disconnect mechanism to represent, wherein the Ausllösendteil is not shown in cross section and the cross-sectional line 1-1 of the area shown in cross section is drawn in Fig. 2,

FIG. 2 shows a horizontal cross section along the line in FIG. 1 Drawn cross-section line 2-2, showing the two poles of the two-pole switch and the safety disconnect tripping mechanism we give

Fig. 3 is a partial, vertical cross-section along the Section line 3-3 drawn in FIG. 2 of the attachment of the movable contact and the structure of the contact carrier reproduces,

FIG. 4 shows a horizontal cross section along the section line 4-4 shown in FIG. 1, showing the reset spring mechanism of the shutter release,

5 shows a vertical cross section along the section line 5-5 shown in FIG. 1, which shows the respective Poles of the switch associated with each other and arranged separately from safety disconnection connection devices reproduces,

6 shows a further enlarged, perspective exploded view of the contact carrier and the driver or the driver cam of the 2 ^ switch illustrated in FIGS. 1 to 5, and FIG

7 shows a cross section corresponding to FIG. 1 without the Push-button area, the switch being in a switch state in which the contacts are welded and the safety isolating device is triggered.

Fig. 1 shows an electrical safety disconnector for operational purposes or for commercial purposes, which in the inventive Way is formed. As shown in Fig. 1, this switch is a double pole switch with a protruding Trigger. This switch is intended to be in the handle of a portable electric tool, for example a Drill, saw or the like. To be used. This switch has one made of insulating material

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Switch frame or one made of insulating material Housing 10, a cover 12 made of insulating material, a switch handle 14 and a switch trigger 16, which is coupled to the switch lever and with a spiral-shaped one The return spring 18, which has its abutment on the cover 12, is biased.

The housing 10 encloses the double-pole switching mechanism with two fixed contacts 20 and 22, which are located at the right end of the housing in FIG. 2, two movable tip contacts 24 and 26, an insulating contact carrier 28 carrying the movable contacts, a driving cam 30 for the snap action of the contacts, which are mounted on the contact carrier, two terminals 32 and 34, which in Fig. 2 at the left end of the housing are shown, two rotatable parts 36, 38 shown in FIGS. 1 and 5, as well as two spiral-shaped tension springs 40 and 42, which serve a twofold purpose, namely on the one hand to give the spring force to the snap mechanism and on the other hand to generate a biasing force for the actuation of the safety disconnection mechanism when the contacts weld.

The switch can also be seen with devices or connections for connecting the switch to an external circuit ν. These devices comprise two clamping screws 44 and 46, in order to connect electrical leads to the terminals of the fixed contacts 20 and 22, as well as two clamping screws 48 and 50, with which electrical lines are connected to the connections 32 and 34, respectively will. One pair of these terminals can be connected to an electrical power source and the other pair can be connected to a load circuit get connected.

As FIGS. 1, 2 and 5 show, the housing 10 made of plastic is rectangular and has a bottom wall, longer front and rear walls 10a and 10b and relatively shorter left and right side walls 10c and 10d, so that a Chamber for the switching mechanism is created. As a swivel joint for the moving contacts is one with the housing

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integrally formed, upstanding bar or rib 10e provided, which protrudes from the bottom of the housing and upwards the front wall 10a connects to the rear wall 10b, as well as being somewhat spaced from the screws 44 and 46 to the movable To keep contacts in both the open and the closed contact position. The left side wall of the case has two spaced apart openings 1Of and 10g (see. Fig. 2), each of which has continuous grooves on the Have the front, the bottom and the back and are open at the top, so that the respective terminals or connections 32, 34 can be pushed in from top to bottom and held in place by the cover, as will be done below will be described. As Fig. 1 shows, the clamping screws are in the upper areas of the connections, for example the Connection 32 screwed in, and these connections are spaced from the end of the housing inwardly, so that the extremely « End of the housing can be provided with a half-height wall 10h to mount the swivel and the preload spring as well to protect the lower area of the connections, while the upper areas of the perforations and the heads remain open the clamping screws can attack. The right side wall of the housing is also provided with two spaced apart openings 10j and 10k provided (see. Fig. 2), the continuous grooves along the front, the bottom and the back or have grooves and are open at the top, so that the respective movable contact is inserted from top to bottom can be and is held with the overlying cover, as will be described below. The clamping screws, for example the clamping screw 44 shown in FIG. 1, goes through the lower areas of the fixed contacts and leave space in the upper areas for the movable contacts come into contact with the fixed contacts.

The cover 12 is provided with a substantially flat area 12a, which rests on the top of the housing, such as 4 and 5 show this to close off the top of the housing. The cover 12 is known on the housing Way, for example by ultrasonic welding or the like.

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attached. This cover is also provided with an inverted channel area 12b, which is located in the central area in the Extends longitudinally, over the flat area 12a and a downwardly open channel 12c, which is used to receive the switch trigger 16 and the switch trigger gives a guide in its to-and-fro movement. A Projection 12d protrudes downward from the cover in the middle within the channel 12c and protrudes into the recess 16b Switch trigger 16 in. This projection 12 d serves as Abutment for one end of the return spring 18. The other end the return spring 18 is compressed by the switch trigger, as will be described below. The cover 12 also has a plate 12e formed in one piece with the cover 12 and protruding downwards into the switch compartment, which extends essentially over the entire width of the switch room and serves as a stop for the movable contacts is used when these are in the open position, as shown in FIG.

The cover 12 is also provided with an extension,

the fastening devices for fastening the switch and trigger pivots. These trigger pivot devices include an inclined area 12 f, the but extends upwards at an angle to the channel 12c and has a transverse hole 12g at the tip, at which the trigger 14 is rotatably mounted by means of a pivot pin 52. The pivot pin 52 goes through the transverse hole and through to the transverse hole 12g aligned two holes in the two sides of the substantially U-shaped trigger. The switch mounting device includes a forwardly offset plate 12h, the from the projection of the cover below the pusher 14- downwards protrudes and has two spaced apart holes 12j, with which the switch can be mounted in the handle of a portable tool. Located on the inclined area 12f a projection 12k, which acts as a stop to limit the movement the trigger when it is pressed down. Two Approaches with an angle of 45 °, for example that in FIG. 5 shown approach 12m, are provided for the respective

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~ ¹⁴ ~ 274778 *

to complementary shaped fixed contacts and connections and hold them in place.

The switch is provided with means for holding the movable contacts and for a snap movement of the movable ones To enable contacts between the closed and open switch position with respect to the stationary contacts when the Handle is pressed. These devices comprise an insulating contact carrier 28, as shown in FIGS. 1 to 3> 5 and is shown. This contact carrier comprises an essentially Flat molded plastic part with a recess 28a along the upper, central area for receiving the Driver 30, as well as two spaced apart grooves 28b and 28c on opposite sides along the bottom of the recess to hold the moving contacts. For this purpose, each groove has one integral thereon formed, round projection which protrudes through a corresponding hole in the movable contact and to the formation a rivet 28d is spread, as shown in Fig. 3, in order to attach the movable contact to the contact carrier.

There is a not very high "back" above the groove at the foot of the rivet 28e provided to the opposing areas of the movable! To distance the contact slightly from the bottom of the groove, as shown in Fig. 3, so that there are narrow manufacturing tolerances are not required for these parts.

As FIGS. 1 and 2 show, each has a movable contact 24 and 26 a flat strip of an electrically good conductive Material, for example made of copper, brass or the like. The flat strip has an upward angle of 90 ° at one end curved area 24-a, 26a to a contact area for To form contact with the corresponding fixed contact. As Fig. 1 shows, the movable contacts protrude through the Slot between the plate 12e and the web 10e through and are rotatably on the web 1Oe. The plate 12e forms one Stop for the upwardly bent area of the moving contact when the switch contacts are in the open position are located.

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The rear ends 24b and 26b of the movable contacts are supported by a mechanism other than just the necessary Downward bias created and resilient depression the rear ends for a snap action of the contacts, but also an automatic safety disconnection of the two circuits guaranteed if the contacts should weld. This mechanism has two of the same kind rotatable parts 36 and 38 and tension springs 40 and 4-2 cooperating with them. As shown in Fig. 1, these are rotatable parts at the connections 32 and 34- rotatably mounted and are with a force in the counterclockwise direction through the tension springs 40 resp. 42 preloaded. Each port is 32 and 34 for this purpose at the lower end with a region 32a, 34a of smaller width provided, as Fig.5 shows. This area of smaller width has a horizontal notch 32b, 34b on the right side, as shown in FIGS. In order to the respective rotatable part 36 and 38 rotatable with this notch cooperates, each rotatable part 36 and 38 has a rectangular slot 36a, 38a on the left side (see. Fig. 1), so that two legs spaced apart from each other are created, which are reduced or narrower in width Spread the area of the connections, as shown in FIG. 5. The bottom of this slot is with the notch in the Terminal engaged, rotatable about the rotatable member on the terminal to hold, as shown in FIGS. 1 and 7 show.

To hold the bias spring 40, the connector 32 has a Section with an outwardly offset tongue 32c which protrudes into this section, as FIG. 1 shows. These The tongue has a hole in which a fastening hook of the spring 40 lies. The spring 42 is in the same way with the connector 34 connected.

The other end of the spring 40 is connected to the rotatable part 36 and gives it a counterclockwise bias. The rotatable part 36 is therefore provided with a hole 36b provided at the upwardly bent end, as shown in Figs. 1 and 5, and a slot 36c directly above the

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This hole forms a narrow section in between, at deiü the other fastening hook of the spring 40 is attached. The rotatable member 58 has a corresponding hole 58b and one corresponding slot 58c fitted to the other fastening hook to attach the tension spring 42 to the narrow section in between.

The upwardly bent end of the rotatable member 56 is with a Shallow rectangular slot 56d formed by two spaced apart upstanding projections is to support the rear end 24b of the movable contact 24, as shown in Figs. The upper end of the rotatable part 58 is with a corresponding Shallow rectangular slot 58d provided to "the rear end 26b of the movable contact 26 to hold.

The switch has means to enable the snap action of the moving contacts and the safety disconnect mechanism alternatively to be triggered if the contacts should merge. These devices include a driver 50, which lies in the recess 28a of the contact carrier 28, as FIG. 1 shows. This driver has two inclined upper ones Surfaces with a right inclined surface 50a and a left one inclined surface 50b which converge at the highest central point and on which the trigger slides, as in the following will be described. This driver also has a flat front and back (see. Fig. 6), see above that the driver between the opposite, flat, front and rear inner walls of the recess 28a in the contact carrier is, as shown in Fig. 2, so that the driver can slide in the recess in the longitudinal direction without that a trip occurs. This is described in detail below. The left side of this driver owns a short, flat and wide protrusion 50c (see Fig. 1, 5 and 6), which is held under a protruding part 28f on the left side of the recess 28a, as shown in Fig.

is shown around this end of the driver on the contact carrier

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to fix. This is necessary because the trigger 16 snaps the driver during normal operation actuated, and the driver moves the contact carrier with. The right side of this driver has a corresponding one in short, flat projection 30d, as shown in FIGS. 1, 2 and Fig. 6 is shown held under a resilient integral tongue or spring member 28g. which protrudes obliquely upwards from the lower right edge of the recess in the contact carrier. The purpose of this one piece formed spring part 28g consists in the driver normally "in the recess in the left position hold, as shown in Fig. 1, but to allow a shift of the driver to the right when the Contacts welded to one another (cf. FIG. 7). Although in the present exemplary embodiment an integrally formed Spring part 28g is shown, however, other devices are also used for this purpose, for example a spiral compression spring can be used between the driver and the right inner wall of the recess 28 instead of the spring part 28g.

The driver 50 also has cooperating with the contact carrier 28 Devices that suddenly trigger the driver downwards when the trigger is moved back in the event of the contacts becoming welded, to open the safety separation connection, as shown in Fig.

is shown. These devices have two legs 3Oe and 3Of which are spaced apart from one another and which extend from the underside of the The driver protrude downward in the direction of the longitudinal axis of the driver, as shown in FIGS. 1, 2 and 6 Leg 35Oe is round and leg 3Of is square, and the lower ends of these legs are on the underside of the recess in the contact carrier.

So that the driver can fall into the recess when triggered, two spaced holes 28h and 28j are in the Provided on the underside or in the bottom of the contact carrier, as shown in FIGS. 1, 2 and 7. Hole 28h is round and long enough to fully accommodate the round leg 3Oe.

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The hole 28j is essentially rectangular (see Fig. 2) and forms a defined, precisely delimited sliding edge for the square leg 30f. Holes 28h and 28j that are larger than the legs 30e and 30f, are so from each other spaced so that the left sliding edges are spaced the same distance from each other as the left sliding edges, the legs 3Oe and 3Of. In this way, both legs fall into the corresponding holes at the same time when triggered, where the square leg 3Of together with the left edge of the rectangular hole 28j the point of the driver movement, at which this occurs.

The switch is provided with devices for triggering the driver 30. These devices include a trigger 16, the one made of an elongated, insulating, plastic part consists. As Fig. 4 shows, this trigger has an enlarged right half 16a with a recess 16b formed therein, in which the return spring 18 and a projection 12d of the cover for holding the return spring 18 are located. As can be seen from Fig. 1, lies one end of the Spring 18 on the right side wall of the recess 16b, and the other end of the spring rests on the fixed projection 12d on. This trigger has a narrower left half 16c that extends along channel 12c in the cover and ends in two opposite, lateral bearing journals, one of which is a bearing journal, namely the bearing journal 16d can be seen in FIG. At this journal, the opposite sides of the substantially U-shaped pusher 14 rotatably mounted so that the rotary movement of the trigger is converted into a straight shift of the shutter release.

The trigger 16 is also provided with a driver projection 16e which protrudes downward from the underside of the larger right half 16a of the trigger 16 and is in contact with the inclined surface of the driver cam 30. This driver projection 16e has a substantially V-shaped cross-section and extends ¹ , completely across the driver cam, which is carried along by the driver projection 16e, like this

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..- • 19- 27A7784

can be seen in Fig. 4 by the dashed lines.

The trigger 16 also has a limit stop 16f on, seen from the driver projection 16e from this spaced, left, as shown in Fig. 1 shows. This stop projection is narrower than the driver projection, such as this is evident from Fig. 4 by the dashed lines, and the stop projection has a vertical left edge, which strikes against the inner surface of the left side wall 10c of the housing to limit the displacement of the trigger, when the pusher is printed. Rounded ribs 16g and 16h (see FIG. 4) on the upper edges of the trigger 16 on opposite sides of the recess 16a reduce the friction opposite the cover.

The function of the switch is described below

will. When the tool handle is gripped by hand and the pusher 14 is depressed with the index finger, the trigger 14 rotates clockwise (see. Fig. 1), and the trigger 16 is pulled in a straight direction to the left. The return spring 18 is compressed and the driver Projection 16e slides on the inclined surface 50a of the driver 30. So that this is possible, the driver 30 must follow Move it down, as the driver projection 16e cannot move upwards. When the driver projection 16e So ver on the inclined surface 30a of the driver upwards pushes, the driver 30 and the contact carrier rotate as well as the movable contacts 24 and 26, which are attached to the contact carrier 28 are attached, counterclockwise, with the movable contacts rotating on a rib 10e. When the rear Ends of the moving contacts go down, rotate rotatable parts 36 and 38 clockwise as shown in FIG Fig. 1 is shown in phantom, and the springs AO and are stretched until the driver projection 16e over the high central point between the inclined surfaces of the Driver slides. Immediately afterwards, the effect upwards tensioned springs 40 and 42 that the driver in the direction of accelerated to the right with a snap action when the

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Slave projection 16e slides down the inclined surface 30b. This driver takes the contact carrier with or moves it, so that the upwardly bent areas 24a and 26a of Movable contacts hit the fixed contacts 20 and 22. This creates two connections or circuits across the corresponding two poles of the switch from the screw terminal 44 to the screw terminal 48 and from the screw terminal 46 closed to screw terminal 50 and the tool motor is connected to the supply source.

When the trigger is released, the return spring operates 18 that the trigger 16 moves back to the right into its starting position. The driver projection 16e slides inclined surface 30b upwards, with the movable contacts Move on the hip or pivot point 1Oe, and the pre-tensioning springs 40 and 42 are pulled apart. After the driver projection 16e has exceeded the highest point, if the driver snaps back to the left, opens the contacts and disconnects the motor of the tool from the supply source. This rotation of the movable contacts causes any small welds on the contacts due to torsion and Shear forces are broken.

It is now assumed that the contacts in the previously described Were closed and welded together. This could be due to an arc discharge or overheating of the surfaces of the movable and fixed contacts, causing the metal to melt and one or both of the movable contacts are welded to the respective fixed contacts. When the trigger is released to open the contacts is, and the driver projection 16e is to move upwards on the inclined surface 30b (see the dash-dots Lined representation in Fig. 7) "so can the driver, the contact carrier and the rear ends of the movable contacts do not rotate upwards, namely not because one or both of the upwardly bent contact areas 24a and 26a with the fixed contacts 20 and 22 are welded and the movable contacts are not on the rib or on the pivot point

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1Oe can turn. As a result, the driver projection 16e presses the driver 30 against the spring force of the spring 28g right, until the driver falls down when the legs 30e and 30f suddenly slide into holes 28h and 28j in the bottom of the contact carrier fall. This relieves the downward pressure on the driver so that the preload springs 40 and 42 due to the length and elasticity of the movable contacts and the spacing of the plate 12e from the movable ones Contacts the rotatable parts 36 and 38 snap upwards can let and come free from the rear ends 24b and 26b of the movable contacts, so that the Schwelssverbindungen break. These bias springs then keep the connections permanently open so that there is no risk of the Switch or a further connection of the contacts is avoided. The lower ends of these rotatable parts remain in the Notches in the connectors lie or remain pressed against the bottom of the case so that they do not fall off and can accidentally touch the moving contacts. The electrical connection was made so despite the fact with one Safety disconnect operation opened that the contacts did not open normally. The switch must then be exchanged in order to be able to switch the tool on again, since the safety disconnection connections are not switched on again can be closed on the outside. Although the switch has to be replaced here, this also leads to a extremely safe and reliable contact separation with the Opening or interruption of the circuit.

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Claims (18)

PATEM T A M SCHIFF ν. RJNER STREHL SCHÜBEIw-HOPF SBÖ1N3HAUS FINCK MARIAHILFPt-A TZ Λ A 3, MÖNCHEN SO 2 7 A 7 7 8 A POSTADRESSEiF1OSTFACH 35 OI6O, D-8OOO MÖNCHEN o-.i CUTLER-HAHMBRLD TRADE, INC. October 25, 1977 DA-5514 Electrical Safety Disconnector Patent Claims 1.) Electrical safety disconnector, characterized by a fixed contact (20, 22), a movable contact (24, 26) which closes and opens with respect to the fixed contact (20, 22) and closes and interrupts an electrical current path, switch actuating devices ( 14, 16, 18, 28, 30)
for the movable contact (24, 26) in order to close and open it, safety disconnection means (36, 38, 40, 42) in the electrical current path, the
this is interrupted when the switch actuating devices (14, 16, 18, 28, 30) are moved to open the movable contact (24, 26) when the movable contact (24, 26) is welded to the fixed contact (20, 22) and does not open. $ 09817/0979 2. Electrical safety isolating switch according to claim 1, characterized in that the safety disconnect connection devices (3 &, 38, 40, 42) are biased and open to break the electrical current path, but usually by the switch operating devices (14, 16, 18, 23, 30) are kept closed and that in the switch actuators (14, 16, 18, 28, 30) Release devices (28a, 28j, 3Oe, 3Of) are provided, which are normally do not move, but when the movable contact (24, 26) is opened in the case of schwelssten contacts are to be triggered, in order to release the pre-tensioned safety disconnecting connection devices (36, 38, 40, 42) and thereby to open them and to interrupt the electrical current paths. 3. Electrical safety isolating switch according to claim 1 or 2, characterized in that the safety isolating connection devices (36, 38, 40, 42) a rotatable part (36, 38) with a link which is rotatable at one end is and at the other end the movable contact (24, 26) holds, and a spring (40, 42) through which a pull occurs on the link which separates the link from the movable contact (24, 26), and that the movable contact (24, 26) the member of the movable part (36, 38) when the switch actuating devices (14, 16, 18, 28.30) normally holds in place. 4. Electrical safety disconnector according to one of claims 1 to 3, characterized in that the switch actuating devices (14, 16, 18, 30) have a displaceable switch release (16), a contact carrier (28) with the movable contact (24, 26) attached to it. , a snap driver (30) on the contact carrier (28), and a device (28g) which presses the driver (30) against the switch trigger (16) so that the switch trigger (16) a snap movement of the movable contact ( 24, 26). 809817/0979 5- Electrical safety disconnector according to one of the claims 1 to 4, characterized in that the switch actuation devices (14, 16, 18, 28, 30) a return spring (18) that triggers the switch (16) when released the actuation of the switch trigger (16) returns to the normal position with open contacts, as well as one of Have hand-operated pusher (14), which actuates the trigger (16) and this against the resistance of the Return spring (18) brings the contacts closed, with the potential energy of the return spring (18) is converted into kinetic energy in order to open the contacts (20, 22, 24, 26) under normal conditions and this kinetic energy the release devices (28a, 28j, 3Oe, 3Of) with welded contacts in a safety disconnect * Brings trip to interrupt the electrical current path. 6. Electrical safety disconnector, characterized by a two-pole switch with two fixed contacts (20, 22), which are provided with terminals (44, 46) for connecting the fixed contacts (20, 22) to an external circuit, two movable contacts (24, 26) which are provided for closing or opening the respective fixed contacts (20, 22) and close or interrupt a two-pole electrical connection, switch actuating devices (14, 16, 18, 28, 30) for the movable contacts (24, 26) to close and open them, two connections (48, 30) to to connect the movable contacts to an external circuit, safety disconnect connection devices (36, 38, 40, 42), which are connected to the two connections (48, 50), can be changed in their position, the movable ones Contacts (24, 26) normally maintain electrical communication with terminals (48, 50) and are biased are to get free of the movable contacts (24, 26) when the contacts are welded, but normally remain in contact with the moving contacts, as well as with the switch actuation devices (14, 16, 18, 28, 809817/0979 provided release devices (28a, 28j, 3Oe, who are usually held in their position, themselves but to open welded contacts (20, 22, 24-, 26) slide to cause a trip and the movable contacts (24, 26) from the safety disconnect connectors (36, 38, 40, 42) to separate so that they come free from the movable contacts (24, 26) and interrupt the two-pole electrical connection. 7 · Electrical safety disconnector according to claim 6, characterized in that the safety disconnect connection devices (36, 38, 40, 42) two rotatable parts (36, 38), each with one end at one of the two Connections (48, 50) are rotatably mounted, as well as two Have tension springs (40, 42) which the other end of the respective rotatable parts (36, 38) with the corresponding Connect the connector (48, 50) to the rotatable part (40, 42) to bias towards the respective movable contact (24, 26). 8. Electrical safety disconnector according to claim 6 or 7 »characterized in that the switch actuating devices (14, 16, 18, 28, 30) have the following parts: a movable handle (14), a switch trigger (16), which moves when the pressure (14) is actuated, an insulating contact carrier (28) on which the two movable ones Contacts (24, 26), spaced apart, fixedly attached, a driver (30) which on detn Contact carrier (28) is located, a device (28e) that the driver (30) against the movement in the direction of movement of the release (16) that opens the contacts with respect to the contact carrier (28), so that the contact carrier (28) is normally located in both the contacts closing position and the contacts The opening direction of movement moves together with the driver (30), but a shift in the case of schwelssten contacts of the driver (30) against the pretensioning device (28g) allows the release devices (28a, 809817/0979 23j, 3Oe, 3Of) and one on the switch trigger (16) provided driver projection (16e) with the The driver (30) is in contact and causes a snap displacement of the driver (30) when the switch trigger (16) is pushed forwards. 9. Electrical safety disconnector according to one of claims 6 to 8, characterized in that the pretensioning device (28g) of the driver (30) consists of an elastic There is a finger between the contact carrier (28) and the driver (30). 10. Electrical safety disconnector according to one of claims 6 to 9 *, characterized in that the elastic finger (28g) with the insulating contact carrier (28) is an integral part. 11. Electrical safety disconnector according to one of claims 6 to 10, characterized in that the Driver (30) prestressing device arranged between the contact carrier (28) and the driver (30) Compression spring is. 12. Electrical safety disconnector according to one of claims 6 to 11, characterized in that the driver (30) has two inclined Mitneheerflachen (30a, 30b) has a middle high point, so that the movable contacts (24, 26) closed with a snap movement and be opened when the driver projection (16e) over this high point in one direction or the other slides. 13. Electrical safety disconnector according to one of claims 6 to 12, characterized in that the movable contacts (24, 26) each have the same elongated, Strip-shaped elements are each attached to the contact carrier (30) with their central area, on one side End have a bend (24a, 24b) which has a contact 809817/0979 area to the stop on the respective fixed contact (20, 22) and a rear end area (24b, 26b) on the other end, that of the safety interconnection devices (36, 38, 40, 42) is supported. 14. Electrical safety disconnector according to one of the claims 6 to 13 »characterized in that the movable contacts (24, 26) on a transverse rib (1Oe) one insulating housing (10) lie, and the transverse rib (1Oe) a fulcrum for supporting the movable contact forming, strip-shaped parts near the bends (24a, 24b) forms to rotate the movable contacts (24, 26) and a sliding movement to the fixed To enable contacts (20, 22). 15. Electrical safety disconnector according to one of the claims 6 to 14, characterized in that the switch actuation devices (14, 16, 18, 28, 30) have a return spring (18), which exerts a force on the switch trigger (16) and this when the trigger is released (14) returns to the starting position. 16. Electrical safety disconnector according to one of claims 6 to 15 »characterized in that the potential Energy of the return spring (18) is converted into kinetic energy, which causes the switch trigger (16) and the driver (30) opens the contacts under normal conditions and causes the switch trigger (16) to be actuated, and brings the driver (30) into a safety disconnect mode of operation when the contacts are welded together, so that the release devices (28h, 28j, 3Oe, 3Of) are triggered and interrupt the electrical connection. 17. Electrical safety separates it according to one of the claims 1 to 16, characterized in that it is used in an electric tool that has a housing with a handle to be held in the hand while the tool is in use, and one for 809817/0979 Operating the tool has provided electric motor, and that the electrical safety disconnector is arranged in the handle and has a push-button (14) protruding therefrom, which is operated by hand to to connect the tool motor to a supply source or to the tool motor from a supply source separate. 18. Electrical safety disconnector according to one of the claims 1 to 17, characterized in that it is used in a portable electric saw. 809817/0979